/**

* Copyright (c) Rich Hickey. All rights reserved.

* The use and distribution terms for this software are covered by the

* Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)

* which can be found in the file epl-v10.html at the root of this distribution.

* By using this software in any fashion, you are agreeing to be bound by

* the terms of this license.

* You must not remove this notice, or any other, from this software.

**/

/* rich 2/28/11 */

package clojure.lang;

public class FnLoaderThunk extends RestFn{

private static final long serialVersionUID = 2194257205455463687L;

final Var v;

final ClassLoader loader;

final String fnClassName;

IFn fn;

public FnLoaderThunk(Var v, String fnClassName){

this.v = v;

this.loader = (ClassLoader) RT.FN_LOADER_VAR.get();

this.fnClassName = fnClassName;

fn = null;

}

public Object invoke(Object arg1) {

load();

return fn.invoke(arg1);

}

public Object invoke(Object arg1, Object arg2) {

load();

return fn.invoke(arg1,arg2);

}

public Object invoke(Object arg1, Object arg2, Object arg3) {

load();

return fn.invoke(arg1,arg2,arg3);

}

protected Object doInvoke(Object args) {

load();

return fn.applyTo((ISeq) args);

}

private void load() {

if(fn == null)

{

try

{

fn = (IFn) Class.forName(fnClassName,true,loader).getDeclaredConstructor().newInstance();

}

catch(Exception e)

{

throw Util.sneakyThrow(e);

}

v.root = fn;

}

}

public int getRequiredArity(){

return 0;

}

public IObj withMeta(IPersistentMap meta){

return this;

}

public IPersistentMap meta(){

return null;

}

}